JP6264104B2 - Intermediate parts for pipe rehabilitation - Google Patents

Description

The present invention relates to a method for rehabilitating an existing pipe by inserting a new rehabilitation pipe into an existing pipe pipe such as a sewer pipe buried in the ground, before the new rehabilitation pipe is inserted. thereby facilitate insertion of the circumferentially disposed is new rehabilitating pipe imaginary, located in the gap of the new rehabilitating pipe and existing pipe imaginary after insertion intermediate for the effect of buffering the stabilization and force new rehabilitating pipe It relates to members.

  Pipes buried in the ground include pipes for sewerage, water supply, agricultural water, agricultural drainage, etc. These pipes need to be renewed or repaired when they are old or damaged. There are cases where existing pipes are removed and replaced with new pipes, or new pipes are laid on a different route, but many methods have been proposed that use existing pipes to provide a small new pipe on the inner surface of existing pipes. Yes.

The applicable rehabilitation method differs depending on the inner diameter of the existing pipe, and the inner diameter of the existing pipe is large (for example, a circular pipe with a diameter of 800 mm to 2,200 mm or a rectangular pipe with a cross-sectional size of 1,200 mm x 1,000 mm). In this case, a worker who has entered the pipe is rehabilitated by attaching a replacement plastic panel to the inner surface of the existing pipe, while the inner diameter of the existing pipe is small (for example, In the case of φ200mm to 350mm), a long circular new resin liner pipe having an outer diameter almost equal to the inner circumference of the existing pipe is once bent and deformed into a C-shaped cross-sectional shape smaller than the existing pipe inner diameter. was inserted into the Yo, such as by a subsequent liner pipe pressure heating is method to rehabilitate by brought into close contact with the existing pipe surface is restored to the circular shape is employed.

  However, if the inner diameter of the existing pipe is about 350mm to 600mm, it is too small for an operator to enter the pipe and attach the panel. It is too big to be restored, hardened.

Therefore, in the case where the inner diameter is about 350 mm to 600 mm as a main object, a new rehabilitation pipe that is smaller than the inner diameter of the existing pipe and shorter than the inner diameter of the manhole provided in advance is prepared in advance and lowered through the manhole. A rehabilitation method has been proposed that inserts into an aging pipe while connecting them one by one (Patent Document 1).

Several improvements have been proposed for the rehabilitation method. For example, in Patent Document 2, a cylindrical intermediate member having deformability is inserted into a gap between an existing pipe and a new rehabilitation pipe. And filling the gap and improving the stability of the installation state of the new rehabilitation pipe. The cylindrical intermediate member is made of a fiber member such as a nonwoven fabric, a porous synthetic resin member or a plant member. Used and pre-impregnated with curable filler.

Furthermore, as a technique for improving the cylindrical intermediate member installed in advance, a progress smoothing portion is provided on the inner peripheral surface of the intermediate cylindrical body so that the new rehabilitation pipe can be smoothly inserted into the intermediate member (Patent Document 3). ), And a technique of disposing an anti-friction member that reduces friction in the intermediate member and in the length direction of the pipeline has been proposed (Patent Document 4). In the technique of Patent Document 3, an intermediate cylindrical body is formed of a nonwoven fabric, and a reinforcing core material is disposed inside the nonwoven fabric. In the technique of Patent Document 4, the intermediate member is referred to as a cushioning material, and a woven or non-woven fabric made of fiber, a synthetic resin foam, or the like is used.

JP-A-4-83987 JP 2009-101596 A JP 2011-56843 A JP 2012-241880 A

As mentioned above, in the method of rehabilitating an existing pipe by inserting a new rehabilitation pipe inside the existing pipe, a process is proposed in which an intermediate member is inserted in the gap between the existing pipe and the rehabilitation pipe. Has been. This intermediate member is mainly required to have the following two performances, namely, ensuring smoothness in the process of inserting the new rehabilitation pipe and position stability after the new rehabilitation pipe is installed.

However, when the inner diameter of the existing pipe is large, the outer diameter of the new rehabilitation pipe to be inserted also becomes large and the weight per unit length also increases. Similarly, when the manhole interval distance of the existing pipe is increased, the insertion length and the number of connected new renovated pipes to be sequentially connected are increased, and the total weight is also increased. In these cases, the increase in frictional resistance when a new rehabilitation pipe is inserted becomes significant. In the conventional technology, the progress smoothing part and the anti-friction member are arranged on the intermediate member, but problems remain in the sliding performance and arrangement method, and the new rehabilitation pipe is caused by peeling, breakage, or catching of the progress smoothing part or the anti-friction member Insertion becomes difficult.

In addition, when the new rehabilitation pipe is inserted and installed, if the filling and buffering performance of the intermediate member is insufficient, the existing rehabilitation pipe will be identified if the existing pipe is partially displaced or deformed during an earthquake or ground subsidence. load is applied to places and their connections, also or new rehabilitating pipe itself subsided by the displacement of the new rehabilitating pipe, results or eccentric, there is a fear of causing damage or leakage of new rehabilitating pipe.

  Furthermore, in the step of preceding insertion into the existing pipe of the intermediate member itself, frictional resistance with the inner surface of the existing pipe during the previous insertion causes breakage or breakage of the intermediate member, resulting in an obstacle to the previous insertion. There are challenges. In addition, it is important to make it sufficiently close to the inner peripheral wall of the existing pipe after prior insertion, but no countermeasure has been established. There is also a problem in handling when the intermediate member is transported to the construction site or pulled into the existing pipe through the manhole on the site.

Therefore, an object of the present invention relates to an intermediate member in a method of rehabilitating an existing pipe by inserting a new renovated pipe into the existing pipe, and handling of the intermediate member, preceding insertion, new renovated pipe insertion An object of the present invention is to provide an intermediate member excellent in smoothness and position stabilization performance of a new rehabilitation pipe.

  In order to solve this problem, the present invention has the following configuration.

(1) In the method for rehabilitating the existing pipe imaginary by inserting a new rehabilitating pipe inside the existing pipe imaginary precedes inserted before inserting the new rehabilitating pipe, the existing pipe imaginary and new rehabilitating pipe An intermediate member disposed in the middle, wherein the intermediate member includes an outer peripheral layer made of a porous polymer material having flexibility and deformability in a thickness direction, and an inner peripheral layer made of a resin sheet A. Intermediate member for pipe rehabilitation method, which is laminated and integrated by surface bonding.

(2) Durometer hardness of the resin sheet surface in the state where the resin sheet A is composed of a thermoplastic resin and the inner peripheral layer made of the resin sheet A and the outer peripheral layer are integrated by surface adhesion (type A) Is in the range of HDA40 to HDA90, The intermediate member for pipe rehabilitation according to (1).

(3) The intermediate member for the pipe rehabilitation method according to (1) or (2), wherein the resin sheet A is made of a polyolefin resin and has a thickness in a range of 0.1 mm to 0.8 mm.

(4) The outer peripheral layer has a thickness in a range of 3 mm to 15 mm before being inserted into an existing pipe, and is for the pipe rehabilitation method according to any one of (1) to (3). Intermediate member.

(5) The surface adhesion between the outer peripheral layer and the inner peripheral layer is mainly bonded by self-bonding of the resin sheet A used for the inner peripheral layer, according to any one of (1) to (4) Intermediate member for pipe rehabilitation method.

(6) the porous polymeric material is a polyolefin resin foam,-out pipe according to any one of the apparent density is in the range of ^{20kg / m 3 ~200kg / m 3} (1) (5) Intermediate material for rehabilitation method.

(7) The porous polymeric material is a nonwoven fabric made of polyester fibers or polyolefin fibers, mass per unit area in the range of ^{200g / m 2 ~1000g / m 2} , JIS L1908: 2000 The intermediate member for the pipe rehabilitation method according to any one of (1) to (5), which has a tensile strength based on 10 kN / m or more.

(8) A plurality of concave grooves are formed in the longitudinal direction of the inner peripheral surface of the inner peripheral layer of the intermediate member in the previous period, and the depth of the concave grooves is in the range of 0.2 mm to 2.0 mm. And the intermediate member for pipe rehabilitation methods in any one of (1) to (7) arrange | positioned by the space | interval of each recessed groove 30mm or less.

(9) The tube according to any one of (1) to (8), wherein the intermediate member is a tubular intermediate member having an inner peripheral layer on the inner side and a joint portion in the longitudinal direction of the outer peripheral layer. Intermediate material for the rehabilitation method.

(10) For the pipe rehabilitation method according to any one of (1) to (9), wherein a layer made of a woven fabric containing fluorine fibers is further laminated on the inner peripheral side surface of the resin sheet A in the inner peripheral layer. Intermediate member.

(11) The intermediate member for a pipe rehabilitation method according to any one of (1) to (10), wherein a resin sheet B is further laminated on the outer peripheral surface of the outer peripheral layer.

(12) The width of the resin sheet B is configured to be 10 mm to 200 mm longer than the width of the outer peripheral layer, and at least one end of both edges in the longitudinal direction of the outer peripheral layer, and 10 mm to 200 mm wide from the edge of the outer peripheral layer. An intermediate member provided with an overlap portion, and when the intermediate member is formed in a cylindrical shape so that the inner peripheral layer is on the inner side, the overlap portion of the resin sheet B is a butt portion and the other portion of the resin sheet B The intermediate member for the pipe rehabilitation method according to (11), wherein the edges are overlapped.

According to the present invention, in the construction method for rehabilitating an existing pipe by inserting a new rehabilitation pipe into the existing pipe, a new rehabilitation is to be arranged between the existing pipe and the new rehabilitation pipe. relates intermediate member preceding inserted before inserting the tube, the intermediate member handling of itself, prior insertability into the inside existing pipe imaginary, insertion smoothness of novel rehabilitating pipe, the position stabilization performance after new rehabilitating pipe inserted An intermediate member for the pipe rehabilitation method is provided.

FIG. 1 is a schematic cross-sectional view in the width direction of a sheet-like intermediate member according to the first embodiment. FIG. 2 is a schematic cross-sectional view in the width direction of the sheet-like intermediate member according to the second embodiment. FIG. 3 is a partially enlarged view of the schematic cross-sectional view of FIG. FIG. 4 is a perspective view schematically showing a cylindrical intermediate member according to the third embodiment. FIG. 5 is a schematic cross-sectional view in the width direction of the sheet-like intermediate member according to the fourth embodiment.

In the present invention, the pipe rehabilitation method is a method of repairing or renewing existing pipes for sewerage, waterworks, agricultural water, agricultural drainage, etc. that are buried underground. This is a method of rehabilitation by inserting a small new rehabilitation pipe inside the existing pipe. New rehabilitation pipes are often inserted into existing pipes via manholes, so long pipes with flexibility and short pipes that can be brought in through manholes are applied. intermediate member according to is particularly suitable for new rehabilitating pipe of short tube size, the method to continue to extend and insert while sequentially connected to the existing pipe imaginary.

The inner diameter of the existing pipe canal that is subject to the pipe rehabilitation method in the present invention is not limited, but it is small for an operator to enter the pipe so that it can be easily bent and deformed. It is particularly suitable for inner diameters that are too large, i.e. on the order of φ350 mm to 600 mm, to insert a compact liner tube that can be restored or restored.

The intermediate member according to the present invention is an intermediate member that is inserted in advance before the new rehabilitation pipe is inserted into the existing pipe and is arranged between the existing pipe and the new rehabilitation pipe.

It is preferable that the intermediate member is cylindrical and fills the entire gap between the existing pipe and the new rehabilitation pipe. However, the edges of the intermediate member may not be joined to each other, and there may be a gap. What is necessary is just to fill with the lower half circumference of the gap of the rehabilitation pipe. There is a tendency that as the number of filling parts increases, the position stabilization performance of the new rehabilitation pipe is excellent. Preferably, it is filled with 3/4 or more rounds, more preferably, the gap is filled within 20 cm in the vicinity of the top of the inside of the pipe, and more preferably the whole circumference is filled. That is. When filling the entire circumference, it is preferable to join the edges of the intermediate member to form a cylinder. The intermediate member may be formed into a cylindrical shape in the manufacturing process of the intermediate member, or may be once manufactured into a sheet shape and rolled into a cylindrical shape on site.

  The intermediate member includes an outer peripheral layer 2 and an inner peripheral layer 1.

Hereinafter, the form of the 1st Example which is an example of the intermediate member for pipe rehabilitation methods concerning this invention is demonstrated with reference to FIG. FIG. 1 is a schematic cross-sectional view in the width direction of a sheet-like intermediate member according to the first embodiment.

  The intermediate member includes an outer peripheral layer 2 and an inner peripheral layer 1. When the intermediate member is formed into a cylindrical shape, the right and left end portions of the inner peripheral layer 1 and the outer peripheral layer 2 in the schematic cross-sectional view become the butted portions. An intermediate layer is provided between the outer peripheral layer 2 and the inner peripheral layer 1, or the outer peripheral layer 2 or the inner peripheral layer 1 is provided with another layer on the outer surface of each layer in order to impart different functions or improve characteristics. Even if a lubricant is applied, it does not matter as long as the effects of the present invention are not impaired.

The outer peripheral layer 2 in the intermediate member has deformability in the thickness direction, and acts as a filler and a cushioning material as the intermediate member. A buffering action that deforms even when subjected to a compression load in the thickness direction works to prevent the inner peripheral layer 1 from peeling, damaging, catching, and inhibiting the insertion smoothness of the new rehabilitation pipe. In addition, since the gap filling property after insertion is good, the external force caused by earthquake or ground subsidence is dispersed, and the buffering action to absorb the displacement and deformation of the existing pipe works effectively, so the position of the new rehabilitation pipe is stabilized. Improve performance.

  The outer peripheral layer 2 in the intermediate member has flexibility, and makes it possible to handle the long sheet-like intermediate member in a cylindrical shape, or be folded or rolled. In addition, even if the cross-sectional shape of the existing pipe is not a round shape but an egg shape or a square shape, the intermediate member can follow the deformation according to the cross-sectional shape. Regardless of the shape, it can be pushed and expanded from the inside of the pipe toward the inner peripheral surface of the existing pipe after insertion.

  The outer peripheral layer 2 is made of a porous polymer material having flexibility and deformability in the thickness direction. The porous polymer material is made of synthetic fiber or synthetic resin and is made porous by gaps caused by entanglement between fibers, open pores or closed pores in the resin, etc., and it is flexible and deformable. have. Since the outer peripheral layer 2 made of a porous polymer material is integrated with the inner peripheral layer 1 by surface adhesion, the deformability in the surface direction is restricted, but the deformability in the thickness direction is expressed.

  Specific examples of the porous polymer material used for the outer peripheral layer 2 include a resin foam and a nonwoven fabric.

  The resin foam is a mixture of a resin and a gas, and its production method is not particularly limited, but it can be easily formed into a sheet by the production method exemplified below. For example, an extrusion foaming method in which a gas or a solvent to be vaporized is melted in an extruder and foamed while being extruded under high pressure. Solvent melting method such as gas impregnation method in which gas is dissolved in resin in a high-pressure vessel and heated at normal pressure and foamed, or resin and a pyrolytic chemical foaming agent are melt-kneaded and foamed at normal pressure heating Normal pressure foaming method, heat decomposing chemical foaming agent in an extruder, heat decomposing and extruding foaming while extruding under high pressure, heat decomposing heat decomposing chemical foaming agent in a press mold, foaming while reducing pressure There is a foaming agent decomposition method such as a press foaming method. In the present invention, the foaming agent decomposition method is preferable from the viewpoint of dimensional stability and foaming homogeneity of the sheet to be molded.

  The resin foam is preferably a resin foam made of polyolefin resin, polyurethane, polystyrene, phenol, vinyl chloride, etc. Among them, the polyolefin resin foam has buffering properties, cushioning properties, and heat-sealing properties. It is excellent in terms of flexibility, flexibility, and the balance thereof, and is more preferable.

Apparent density of the polyolefin resin foam for use in the present invention range from 20kg ^{/ m 3} ~200kg ^/ m 3 is preferred. When the apparent density is 20 kg / m ³ or more, mechanical properties such as excellent compression characteristics and high elongation can be imparted. When the apparent density is 200 kg / m ³ or less, excellent handling properties, cushioning properties, cushioning properties, and impact resistance can be obtained while securing deformation performance. Further, it is easy to give the sheet a curvature and deform it into a cylindrical shape, and it is possible to remarkably suppress the occurrence of bending and wrinkling even when the sheet is bent. The apparent density shown here indicates a numerical value measured by a measuring method according to JIS K7222: 2005. Even more preferably a ^{20kg / m 3 ~70kg / m 3} .

  The non-woven fabric used for the porous polymer material used as the outer peripheral layer 1 is a sheet formed by collecting fibers in one direction or randomly, and then chemically bonded with an adhesive resin, mechanically entangled, It is obtained by entanglement with a flow of water applied or bonding with heat-bonding fibers. Basically, long fibers and short fibers can be processed into non-woven fabrics.

  Of these, non-woven fabrics made of polyester fibers and / or polyolefin fibers are preferred. Nonwoven fabric made of polyester fiber has strength and is excellent in wear resistance, durability, weather resistance, heat resistance, moisture resistance, and chemical resistance. Nonwoven fabrics made of polyolefin fibers are low in strength and heat resistance, but are inexpensive and have excellent waterproof, moisture, and oil and chemical resistance.

In the polyester fibers and / or polyolefin fibers, it is preferred that the mass per unit area in the range of ^{200g / m 2 ~1000g / m 2} , by this, proper compressive deformability, strength and elongation, deformation follow-up Sex. By setting the mass per unit area of the nonwoven fabric to 200 g / m ² or more, excellent buffering properties, cushioning properties and impact resistance can be obtained. Moreover, the initial thickness of a nonwoven fabric can be made moderate by setting it as 1000 g / m < ² > or less.

The nonwoven fabric used in the present invention preferably has a tensile strength of 10 kN / m or more based on JIS L1908: 2000, and is effective for preventing breakage and partial breakage when handling as an intermediate member or inserting a new rehabilitation pipe. It is.

  The non-woven fabric in the present invention is preferably formed by depositing long fibers to form a web continuously and then forming a sheet by welding or adhesion. Thereby, it can have bulkiness and elasticity, has good shape stability, has high elongation in the in-plane direction, and is homogeneous, so it is suitable as the outer peripheral layer of the present invention.

The thickness of the outer peripheral layer 2 is preferably in the range of 3 mm to 15 mm before being inserted into the existing pipe. If the thickness of the outer circumferential layer 2 is less than 3 mm, it is insufficient to fill the gap between the inner circumference of the existing pipe and the outer circumference of the new renovated pipe, or even if filled, the amount of compressive deformation is small, and the required buffering property, It may not satisfy cushioning and impact resistance. The thickness is larger than 15 mm, to a fill the gap of the outer periphery of the inner periphery and the new rehabilitating pipe of the existing pipe is too thick as the initial thickness, the resistance when inserting while push the new rehabilitating pipe becomes too large . A more preferable range of the thickness is 3 mm to 10 mm.

The inner peripheral layer 1 is made of a resin sheet A. The resin sheet A can be manufactured by a calendar molding or an extrusion molding using a synthetic resin as a raw material. The outer peripheral layer 2 is a porous polymer material having deformability in the thickness direction, and this surface has no smoothness and a high friction coefficient. Therefore, by covering the outer peripheral layer 2 with the resin sheet A, the insertion smoothness of the new rehabilitation pipe can be improved.

  The material constituting the resin sheet A used for the inner peripheral layer 1 is preferably a thermoplastic resin. Thermoplastic resins include polyolefin resins such as polyethylene and polypropylene, vinyl chloride resins, polystyrene resins, ABS resins, polyamide resins, polycarbonate resins, polyester resins, etc., and thermoplastic polyurethane, butadiene rubber, nitrile rubber, neoprene, polyester. Synthetic rubbers or elastomers such as these or mixtures thereof can be used.

Among these, polyolefin resin is more preferable, and the smoothness of inserting a new rehabilitation pipe is enhanced. The polyolefin-based resin is a polymer or copolymer of an olefin-based hydrocarbon, and polypropylene, polyethylene (high density polyethylene, low density polyethylene), and copolymers thereof are typical. Polyolefin resins are inexpensive and have excellent mechanical properties among thermoplastic resins, so they are not only used in a wide range of fields as structural materials, but also waterproof, moisture-proof, oil-resistant, chemical-resistant, and have a certain degree of low friction. In addition, it has excellent wear resistance as well as excellent uniformity during sheet forming.

The optimum thickness of the resin sheet A varies depending on the type and characteristics of the resin, but is preferably in the range of 0.05 mm to 2.0 mm. Among these, in the resin sheet A which uses polyolefin resin, it is preferable that the sheet thickness exists in the range of 0.1 mm-0.8 mm. By making the thickness within the range of 0.1 mm to 0.8 mm, it is possible to further optimize the balance of strength, slipperiness and flexibility, and deformation followability. If the thickness is less than 0.1 mm, it will be caught when a new rehabilitation tube is inserted, and as a result, it will be easily broken. If the thickness is greater than 0.8 mm, the sheet molding itself becomes difficult, and the flexibility as an intermediate member is lowered, resulting in poor handling.

  By being a thermoplastic resin, it is easy to obtain the resin sheet A by calendar molding or extrusion molding, and it is suitable for bonding and heat-sealing to the outer peripheral layer 2 in a state immediately after solidification and before solidification.

  In the intermediate member obtained by surface-bonding the resin sheet A using a thermoplastic resin, the surface hardness of the inner peripheral surface of the resin sheet A is preferably in the range of HDA 40 to HDA 90 in durometer hardness (type A). . Durometer hardness (type A) is a kind of indentation hardness, and type A is obtained from the indentation depth when a cone-shaped indenter with a tip diameter of 0.79 mm and a tip angle of 35 ° is loaded. Measured according to JIS K7215: 1986.

The durometer hardness does not indicate the surface hardness of a single sheet in a thin sheet material, but is an index of hardness including a base material that supports the sheet from the back surface, and is a useful index in the present invention. Become. Because the durometer hardness (type A) is HDA40 or higher, when the intermediate member is pulled into the existing pipe shovel, the tensile strength of the intermediate member is excellent, and when inserting a new renovated pipe, low friction It is preferable at the point which is excellent in property. Thereby, when inserting a new rehabilitation pipe | tube, a deformation | transformation of the resin sheet surface is also suppressed and generation | occurrence | production of the trouble which can be caught can also be suppressed. When the HDA is 90 or less, the flexibility of the intermediate member and the deformability in the thickness direction are excellent, so that it becomes easier to fold or roll the long sheet-like intermediate member. For the same reason, it is easy to form a folded or rolled sheet into a cylinder, and further, it is easy to draw the sheet long in the field and insert it into an existing pipe via a manhole. Furthermore, resistance when following deformation according to the existing pipe inner surface shape can also be suppressed. By setting the durometer hardness to HDA50 to HDA80, the handling property, the advance insertion property, and the smoothness of the new rehabilitation tube insertion can be realized in a more balanced manner, which is more preferable.

  The intermediate member of the present invention is formed by laminating the inner peripheral layer 1 on the inner peripheral side of the outer peripheral layer 2 and integrating the outer peripheral layer and the inner peripheral layer by surface bonding.

In the above description, when the inner circumferential layer 1 and the outer circumferential layer 2 are “laminated”, the inner circumferential layer 1 has a surface having substantially the same dimensions as the outer circumferential layer 2 and when the two are bonded together, The inner peripheral side of 2 is substantially covered with the inner peripheral layer 1 and indicates a state where there is no exposure. However, at the edge in the longitudinal direction of the intermediate member, even if the width of the inner peripheral layer 1 is small due to restrictions on the manufacturing process and the outer peripheral layer 2 may be exposed beyond the inner peripheral layer 1, It does not matter as long as the effect of the present invention is not impaired. The protrusion width is preferably within 10 cm.

  Further, as a case where the inner peripheral side of the outer peripheral layer 2 is exposed, the inner peripheral layer 1 may be partially subjected to small hole processing or slit processing for the purpose of handling the intermediate member, or a minute end that is unavoidable in manufacturing. There may be partial displacement, but there is no particular limitation as long as the effects of the present invention are not impaired.

  On the contrary, even if the inner peripheral layer 1 is larger than the outer peripheral layer 2, there is no problem as long as the effects of the present invention are not impaired.

As a result, when the inner peripheral layer 1 and the outer peripheral layer 2 are surface-bonded, a strong and uniform adhesive strength is obtained, both of which are difficult to peel off, and the porous outer peripheral layer 2 is not exposed to the inner peripheral side. Since it will be in a state, the frictional resistance at the time of inserting a new renovated pipe can be prevented from being increased and caught.

  Also, when the intermediate member is inserted into the existing pipe beforehand, the intermediate member will be pulled from the outlet side of the existing pipe, but since it is integrated with uniform adhesion, it breaks as an intermediate member, Troubles such as partial breakage and peeling can be reduced.

  Also, that the outer peripheral layer 2 and the inner peripheral layer 1 are integrated by surface bonding means that the non-bonded surface continuously spreads, such as point bonding, bead-shaped bonding, and partial double-sided tape bonding. It means not. Unless the effects of the present invention are impaired, the entire surface is not necessarily bonded. By integrating by surface bonding, sufficient adhesive strength can be obtained, and even when folded or curved, the occurrence of wrinkles, floating, peeling, etc. can be suppressed.

  In order to bond the outer peripheral layer 2 and the inner peripheral layer 1 to each other, an adhesive may be applied and bonded to either or both adhesive surfaces, or either of the adhesive surfaces may be heated, melted, and heated. You may bond together by melt | fusion. When an intermediate layer is provided between the outer peripheral layer 2 and the inner peripheral layer 1, the respective layers may be bonded together with an adhesive, or the bonding surface or both surfaces of each layer may be heated and melted to heat melt. You may wear it. Moreover, you may combine both.

  When an adhesive is applied and bonded to the adhesive surface, a urethane-based adhesive or the like can be selected as the adhesive, and it can be applied to the entire adhesive surface with various coating roll coaters or the like.

  On the other hand, when the resin sheet used for the inner peripheral layer 1 is adhered by self-fusion, strong and uniform surface adhesion can be obtained reliably and easily. In addition, another adhesive application step can be omitted, and no new adhesive layer or adhesive interface is formed between the outer peripheral layer 2 and the inner peripheral layer 1, so that also in terms of economy and quality reliability. preferable. If it is a thermoplastic resin, it is easy to obtain a resin sheet by calendar molding or extrusion molding, and it is suitable for bonding and heat-sealing to the outer peripheral layer 2 in a state immediately after solidification and before solidification.

  In this invention, it is also preferable to give uneven | corrugated shapes, such as an emboss shape, to the inner peripheral side surface of the inner peripheral layer of an intermediate member. Hereinafter, the form of 2nd Example of the intermediate member based on this invention is demonstrated using FIG. 2, FIG. FIG. 2 is a schematic cross-sectional view in the width direction of the sheet-like intermediate member according to the second embodiment, and FIG. 3 is a partially enlarged view of the schematic cross-sectional view of FIG.

  A plurality of concave groove shapes 5 are formed in the longitudinal direction (direction orthogonal to the circumferential direction) of the inner peripheral surface of the inner peripheral layer 3. The depth of the concave groove is preferably in the range of 0.2 mm to 2.0 mm, and more preferably 0.5 mm to 1.5 mm. It is preferable to arrange | position with the space | interval of each concave groove at 30 mm or less, and it is more preferable that it is 5 mm or less. The lower limit is preferably 2 mm or more. When embossing for forming the groove shape 5 is performed, it is preferable that the laminated structure of the outer peripheral layer 4 and the inner peripheral layer 3 is maintained without interruption. For this purpose, the concave groove shape to be formed is inverted. A method of transferring the concave groove shape using a pressing die having a shape is preferable.

By applying the concave groove shape 5 described above, there is an effect that the contact area between the inner peripheral layer 3 and the new renovated pipe to be inserted is reduced and the frictional resistance is further reduced. Further, since the grooves are finely arranged in the longitudinal direction, when the intermediate member is bent from a sheet shape to a cylindrical shape, it can be bent with a substantially uniform curvature, and generation of large wrinkles and bends can be prevented. . A groove shape may also be formed in a direction (circumferential direction) perpendicular to the groove, and the groove shape may be formed in a so-called lattice shape. In that case, the contact area between the inner peripheral layer 3 and the new renovated pipe to be inserted can be further reduced, the frictional resistance can be further reduced, and the bending for folding or rolling in the longitudinal direction of the intermediate member is also possible. Can be easily done. The method of applying the groove shape 5 in one direction or in a lattice shape is not particularly limited. However, as a method using a pressing die, a metal roll engraved with a convex shape obtained by inverting a predetermined groove shape 5 is prepared, and the outer peripheral layer 4 After being integrated from the surface side of the inner peripheral layer 3 after being heated by a heat source such as hot air or a heater, the metal roll is pressurized and the groove shape is transferred or discharged from an extruder or the like and melted. When the resin sheet is cooled and pressure-bonded to the outer peripheral layer 4, a method of applying pressure by the metal roll disposed on the resin sheet side and transferring the groove shape can be applied.

  By setting the depth of the concave grooves and the interval between the concave grooves within the above range, it is preferable because appropriate flexibility can be obtained and the curvature with a smooth curvature can be maintained.

  Next, a third embodiment in which the intermediate member according to the present invention is cylindrical will be described with reference to FIG.

  FIG. 4 is a perspective view schematically showing a cylindrical intermediate member according to the third embodiment. By forming the intermediate member into a cylindrical shape so that the inner peripheral layer 6 is on the inner side and joining the longitudinal edge portions 8 of the outer peripheral layer 7 to each other, the intermediate member is formed into a cylindrical intermediate member. Later, the cylindrical state is maintained, which is preferable. Further, if the cylindrical step is added to the manufacturing process of the intermediate member, the trouble of cylindrically forming the sheet at the construction site can be omitted.

The cylindrical outer diameter of the intermediate member is usually almost the same or slightly larger than the inner diameter of the existing pipe to be inserted, but if the cylindrical intermediate member is folded into a flat shape, for example, and then expanded after insertion, Good. In order to spread, when compressed air is supplied to the inside of the intermediate member to inflate it, or when a new rehabilitation pipe is inserted inside the intermediate member, the tip of the new rehabilitation pipe moves the intermediate member to the inner peripheral surface of the existing pipe. You can spread while pressing.

  The method of rounding the sheet-like intermediate member into a cylinder is not particularly limited. For example, the sheet-like intermediate member having a width corresponding to the outer diameter when the sheet is formed into a cylinder is passed through a cone-shaped base. There is a way to make it. For joining the edges, heat fusion (hot and melted with hot air, ultrasonic waves, high frequency, etc. and then crimping), adhesion with adhesive tape, etc., stitching with sewing thread (both edges are zigzag machined) For example, a method such as sewing) or joining with a stapler (a U-shaped metal needle is driven into a shape that crosses the joint with a stapler) can be applied.

  In particular, when the outer peripheral layer 7 of the intermediate member is made of a polyolefin resin foam, a method of forming a cylinder by thermally fusing the edge portions 8 together is effective.

  On the other hand, when the outer peripheral layer 7 of the intermediate member is made of a nonwoven fabric made of polyester fiber or polyolefin fiber, a method of forming the cylinder by joining the edge portions 8 with a sewing thread or a stapler is effective.

In the present invention, it is preferable to further laminate a layer made of a woven fabric containing fluorine fibers on the inner peripheral surface of the resin sheet in the inner peripheral layer, thereby further greatly improving the sliding performance when a new rehabilitation pipe is inserted. be able to. When the inner surface irregularity of the existing pipe is large and the inner surface of the intermediate member is also affected, a local increase in insertion resistance occurs, but the slip resistance is small, which is very effective in reducing insertion trouble.

  As the fluorine fiber used in the present invention, polytetrafluoroethylene fiber is preferably used. Examples of the material constituting the polytetrafluoroethylene fiber include a tetrafluoroethylene homopolymer, or a copolymer in which 90 mol% or more, preferably 95 mol% or more of the whole is tetrafluoroethylene. Therefore, it is preferable that the content of tetrafluoroethylene units is large, and a homopolymer is more preferable.

  Examples of the monomer copolymerizable with tetrafluoroethylene include vinyl fluoride compounds such as trifluoroethylene, trifluorochloroethylene, tetrafluoropropylene, hexafluoropropylene, and further propylene, ethylene, isobutylene, styrene, acrylonitrile, and the like. Examples of the vinyl compound include, but need not be limited to these. Among these monomers, a vinyl fluoride compound, which is also a compound having a high fluorine content, is preferable from the viewpoint of fiber friction characteristics.

When bonding a fabric containing fluorine fibers to the inner peripheral surface of the resin sheet, in order to cover the characteristics of non-tacky fluorine fibers, the fabric is a multi-layer fabric, and on the back surface that serves as the adhesive surface with the resin sheet It is preferable to mainly arrange fibers other than fluorine fibers, which improves the adhesion between the woven fabric and the resin sheet, and in the new rehabilitation pipe insertion process, measures against peeling, wrinkles, and floats are perfect, thus avoiding trouble. Works. A multilayer fabric is a fabric that can take a structure in which the ratio of the fibers constituting the surface layer and the fibers constituting the back surface layer is different when two or more kinds of fibers are used. A multi-woven fabric such as a double woven fabric made of the above, and a woven fabric such as a satin woven fabric, a twill woven fabric, a horizontal double woven fabric, and a vertical double woven fabric are also applicable.

  In the present invention, in the multilayer fabric, it is preferable that the surface layer is mainly composed of fluorine fibers in order to improve sliding properties, and the back layer of the fabric is mainly composed of fibers other than fluorine fibers in order to improve adhesion. When the back surface layer is mainly composed of fibers other than the fluorine fibers, the amount of the fluorine fibers disposed and exposed in the back surface layer is relatively reduced, and the adhesion to the resin member can be improved. Of the fibers observed from the back surface of the multilayer fabric, the area ratio occupied by the fluororesin fibers is preferably 50% or less, and more preferably 25% or less.

  The material constituting the fiber other than the fluorine fiber is not particularly limited, but can be preferably selected from polyester, nylon, acrylic, glass, vinylon, polyurethane, polyphenylene sulfide, and the like.

  In the present invention, it is preferable to further laminate the resin sheet B on the outer peripheral side of the outer peripheral layer.

  The form of 4th Example which laminates | stacks the resin sheet B on the surface of the outer peripheral side of an outer peripheral layer is demonstrated using FIG.

  FIG. 5 is a schematic cross-sectional view in the width direction of the sheet-like intermediate member according to the fourth embodiment. When the intermediate member is formed into a cylindrical shape, the left and right end portions of the outer peripheral layer 10 in the schematic cross-sectional view serve as butted portions.

  It is preferable to further laminate a resin sheet B11 on the outer peripheral surface of the outer peripheral layer 10.

  The resin sheet B <b> 11 here is a sheet made of synthetic resin, but it is preferable to apply a resin sheet similar to the resin sheet A that can be used as the inner peripheral layer 9. Like the resin sheet as the inner peripheral layer 9, the resin sheet B11 is more preferably integrated with the outer peripheral layer by surface bonding.

  When the intermediate member is inserted into the existing pipe, the intermediate member is pulled from the outlet side of the existing pipe. By laminating the resin sheet B11 on the outer peripheral layer 10, the slip resistance can be reduced or the outer peripheral layer can be reduced. There is an effect of preventing 10 from being caught.

  Furthermore, the intermediate member is further reinforced by laminating a resin sheet on both the inner peripheral layer 9 and the outer peripheral side and bonding the outer peripheral layer 10 to the outer peripheral layer 10, and the intermediate member is broken or partially damaged. This problem is further solved.

  Moreover, it is preferable that the width of the resin sheet B11 laminated on the outer peripheral side of the outer peripheral layer 10 is 10 mm to 200 mm longer than the width of the outer peripheral layer 10 and the overlap portion 12 is provided at least at one end. The overlap portion 12 is preferably 10 mm to 200 mm wide from the edge of the outer peripheral layer 10. Accordingly, when the intermediate member is formed in a cylindrical shape so that the inner peripheral layer 9 is on the inner side, the other edge of the resin sheet B11 is overlapped with the overlap portion 12 of the resin sheet B11 on which the outer peripheral layer 10 is laminated. To do. By further overlapping the resin sheet B11 that is laminated on the entire outer periphery of the outer peripheral layer 10, it is possible to act as a cylindrical waterproof layer.

The overlapping surface exhibits waterproof sealing properties by receiving compression from both the existing pipe and the new renovated pipe via the intermediate member. The overlapped resin sheet portion can be further subjected to ultrasonic welding, heat fusion, adhesive application, etc. to further ensure the sealing performance. In this case, it is also possible to omit the step of heat sealing, stitching and joining the edges of the outer peripheral layer by forming a cylinder.

In the new rehabilitation pipe by the existing pipe rehabilitation method, it is necessary to have both functions of preventing water leakage from inside the rehabilitation pipe and preventing intrusion from outside the existing pipe rehabilitation . In the existing existing pipe rehabilitation method, it is necessary to apply a waterproof seal to the connection part of each rehabilitation pipe each time a new rehabilitation pipe is newly inserted. The work to be performed requires labor and time, and it is a problem that it is not easy to obtain perfect water-stopping. In addition, it has been pointed out that various connections are applied to each connection part of each rehabilitation pipe due to ground subsidence, earthquakes, and other vibrations, and the waterproof seal deteriorates with time and the sealing performance deteriorates.

On the other hand, it becomes possible to omit or reduce the waterproof seal of the rehabilitating pipe connecting portion by imparting a waterproof seal to the resin sheet B11 in which the outer peripheral side of the outer peripheral layer 10 according to the present invention is laminated. Especially for longitudinal rehabilitating pipe, while the waterproof seal subjecting each rehabilitating pipe connecting portion is subjected to various loads, since the resin sheet B11 has become one tubular waterproof layer mono longitudinally waterproof seal It is effective for countermeasures against deterioration.

DESCRIPTION OF SYMBOLS 1 ... Inner peripheral layer 2 ... Outer peripheral layer 3 ... Inner peripheral layer 4 ... Outer peripheral layer 5 ... Concave groove shape 6 ... Inner peripheral layer 7 ... Outer peripheral layer 8 ... Edge 9 in the longitudinal direction of the outer peripheral layer ... inner peripheral layer 10 ... outer peripheral layer 11 ... resin sheet B
12 ... Overlap part

Claims (11)

In method for rehabilitating the existing pipe imaginary by inserting a new rehabilitating pipe inside the existing pipe imaginary precedes inserted before inserting the new rehabilitating pipe, disposed intermediate of the existing pipe imaginary and new rehabilitating pipe An intermediate member made of a porous polymer material having flexibility and deformability in the thickness direction, and an inner peripheral layer made of the resin sheet A by surface bonding. Ri Na and integrally laminated, surface bonding of the resin sheet a and the outer peripheral layer is one which is adhered by the self-fusion of the resin sheet a used in the inner peripheral layer mainly intermediate for Kankyo rehabilitation method Element. The resin sheet A is made of a thermoplastic resin, and the durometer hardness (type A) of the resin sheet surface in a state where the inner peripheral layer made of the resin sheet A and the outer peripheral layer are integrated by surface bonding is HDA 40 to The intermediate member for a pipe rehabilitation method according to claim 1, which is within the range of HDA90. The intermediate member for the pipe rehabilitation method according to claim 1 or 2, wherein the resin sheet A is made of a polyolefin-based resin and has a thickness in a range of 0.1 mm to 0.8 mm. The intermediate member for the pipe rehabilitation method according to any one of claims 1 to 3, wherein the outer peripheral layer has a thickness of 3 mm to 15 mm before being inserted into an existing pipe. The porous polymeric material is a polyolefin resin foam, the apparent density for sewer rehabilitation method according to any one of claims 1 to 4 in the range of 20kg ^{/ m 3} ~200kg ^/ m 3 Intermediate member. The porous polymeric material is a nonwoven fabric made of polyester fibers or polyolefin fibers, mass per unit area in the range of ^{200g / m 2 ~1000g / m 2} , JIS L1908: tensile strength based on 2000 The intermediate member for the pipe rehabilitation method according to any one of claims 1 to 4 , wherein the thickness is 10 kN / m or more. A plurality of concave groove shapes are formed in the longitudinal direction of the inner peripheral surface of the inner peripheral layer of the intermediate member, and the depth of the concave grooves is in the range of 0.2 mm to 2.0 mm, and each The intermediate member for the pipe rehabilitation method according to any one of claims 1 to 6 , wherein the interval between the concave grooves is 30 mm or less. It said intermediate member is an inner circumferential layer and the cylindrical inside, for sewer rehabilitation method according to any one of claims 1 to 7 in the longitudinal direction of the outer peripheral layer is a cylindrical intermediate member having a joint portion Intermediate member. The intermediate member for a pipe rehabilitation method according to any one of claims 1 to 8, wherein a layer made of a woven fabric containing fluorine fibers is further laminated on the inner peripheral surface of the resin sheet A in the inner peripheral layer. The intermediate member for the pipe rehabilitation method according to any one of claims 1 to 9 , wherein a resin sheet B is further laminated on the outer peripheral surface of the outer peripheral layer. The width of the resin sheet B is configured to be 10 mm to 200 mm longer than the width of the outer peripheral layer, and at least one end of both edges in the longitudinal direction of the outer peripheral layer, an overlap portion having a width of 10 mm to 200 mm from the edge of the outer peripheral layer When the intermediate member is cylindrical so that the inner peripheral layer is on the inside, the overlap portion of the resin sheet B is the butted portion and the other edge of the resin sheet B is The intermediate member for a pipe rehabilitation method according to claim 10, which overlaps.